[Commonizer] Use more compact interner based on THashSet

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/utils/Interner.kt

@@ -5,8 +5,10 @@
 
 package org.jetbrains.kotlin.descriptors.commonizer.utils
 
-class Interner<T : Any> {
-    private val pool = com.intellij.util.containers.Interner.createWeakInterner<T>()
+import com.intellij.util.containers.OpenTHashSet
 
-    fun intern(value: T): T = pool.intern(value)
+class Interner<T : Any> {
+    private val pool = OpenTHashSet<T>()
+
+    fun intern(value: T): T = pool.getOrAdd(value)
 }

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/utils/Interner.kt.201

@@ -1,14 +0,0 @@
-/*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package org.jetbrains.kotlin.descriptors.commonizer.utils
-
-import com.intellij.util.containers.WeakInterner
-
-class Interner<T : Any> {
-    private val pool = WeakInterner<T>()
-
-    fun intern(value: T): T = pool.intern(value)
-}

prepare/compiler/compiler.pro

@@ -166,6 +166,7 @@
 -keep class com.intellij.util.containers.hash.EqualityPolicy { *; }
 -keep class com.intellij.util.containers.hash.EqualityPolicy.* { *; }
 -keep class com.intellij.util.containers.Interner { *; }
+-keep class com.intellij.util.containers.OpenTHashSet { *; }
 -keep class gnu.trove.TIntHashSet { *; }
 -keep class gnu.trove.TIntIterator { *; }
 -keep class org.iq80.snappy.SlowMemory { *; }